<template>
  <div class="swiper-container">
    <div class="swiper-wrapper">
      <div class="swiper-slide" v-for="(skuImage, index) in skuImageList" :key="skuImage.id">
        <img :src="skuImage.imgUrl" :class="{active:currentIndex == index}" @click="changeCurrentIndex(index)" />
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>

import Swiper from 'swiper'
export default {
  name: "ImageList",
  props: ['skuImageList'],
  data () {
    return {
      // 当前索引，可以使选中图片高亮
      currentIndex: 0
    }
  },
  methods: {
    changeCurrentIndex (index) {
      // 改变当前索引
      this.currentIndex = index;
      // 把改变后的索引值传递给放大镜组件，引起放大镜组件中图片的变化
      this.$bus.$emit('getIndex', this.currentIndex)
    }
  },
  watch: {
    skuImageList (newVal, oldVal) {
      this.$nextTick(() => {
        new Swiper('.swiper-container', {
          direction: 'horizontal',
          // 每个容器显示的图片数量
          slidesPerView: 3,
          // 设置切换图片时多少为一组
          slidesPerGroup: 1,

          // 分页器pagination
          pagination: {
            el: '.swiper-pagination'
          },

          // 前进/后退按钮
          navigation: {
            nextEl: '.swiper-button-next',
            prevEl: '.swiper-button-prev'
          }

        })
      })
    }
  }
}
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;
      cursor: pointer;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>
